Fix issue with enthalpy based states trying to use EoS before construciton #7028

Job	Run time
Check Spelling	9s
Check code formatting (Black)	32s
Compatibility tests	4m 47s
Pylint	5m 9s
Build Sphinx docs	5m 31s
pytest (py3.9/linux)	20m 45s
pytest (py3.9/win64)	32m 31s
pytest (py3.10/linux)	13m 40s
pytest (py3.10/win64)	30m 35s
pytest (py3.11/linux)	20m 18s
pytest (py3.11/win64)	37m 55s
pytest (py3.12/linux)	12m 43s
pytest (py3.12/win64)	30m 43s
Upload coverage report (Codecov) (linux)	13s
Upload coverage report (Codecov) (win64)	10s
	3h 35m 41s

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